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Author
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Topic: Rear wheel Disc Brakes
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mellowyellow
Gearhead Posts: 1358
From: So. Fl.
Registered: Aug 2000
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posted 11-13-2000 03:57 PM
  
When I acquired my new 68 cvt from a friend, I acquired boxes of new parts. With it came a new, in the box, SSB rear wheel disc setup. I have read one article that downplays rear discs and have heard the same from others, also. I have looked at Sig's article on bigger drums, also. THe car has fact disc brakes up front. Would like to hear some feedback. Thanks, Pete
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cpmaverick
Moderator Posts: 829
From: Auburn, AL.
Registered: Jan 2000
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posted 11-13-2000 05:49 PM
They look cool...And also, they look cool. The stopping difference between big drums and discs is probably negligable, especially for street use. But they do look cool.
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SteveLaRiviere
Administrator Posts: 14060
From: Saco, Maine MCA # 47773
Registered: May 99
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posted 11-13-2000 06:14 PM
The problem with the Versailles rear disc setup is that it is a fixed caliper mount, and they are prone to cracking, from what I've heard. There was an article in one of the Mustang mags recently saying rear disc brake conversions aren't all they've 'cracked up' to be. {pun intended} ------------------
SteveLaRiviere/Webmaster -- MCA # 47773 Have rice for dinner, not transportation!
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mellowyellow
Gearhead Posts: 1358
From: So. Fl.
Registered: Aug 2000
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posted 11-13-2000 07:12 PM
I think I read that same article. I am leaning toward drums and selling the setup. A local guy wants to buy it I was hoping to hear a before and after story.
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cpmaverick
Moderator Posts: 829
From: Auburn, AL.
Registered: Jan 2000
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posted 11-13-2000 07:19 PM
I've done the Versailles swap, and know of several others who have as well. I don't know of any cracking problems. The setup works great for me as far as dependability and durability. The problems with it are weight and cost. Parts are hard to find and usually expensive. Aftermarket disc kits stop as well and are much lighter.
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bossman
Gearhead Posts: 110
From: Moreno Valley, CA, USA
Registered: Jun 2000
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posted 11-13-2000 07:57 PM
Carroll Shelby used the 2.5 inch rear "station wagon" brakes on his street and race cars. I agree, that unless you are doing some serious racing OR have some 17 or 18 inch wheels that show EVERYTHING between the spokes, use 2.5 drums and use the money from the kit on something else. I have opted for the 2.5 inch rear drum setup on my own 65 X-xtremestang. My buddy, on the other hand, has Baer monster rotors and calipers due to the fact he is running 17 x 8 TT IIs. A bit overkill, but everyone spends their money differently on their project!!randy www.bossman-motorsports.com
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kcode
Gearhead Posts: 1332
From: alvaton,ky,usa Suburb of Bowling Green, M&M #79, MCA #29208
Registered: Jun 99
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posted 11-13-2000 10:48 PM
Mellow
I've got the SS Disc Brakes on the rear of Beckys convertible. I can't tell you how they work or hold up since the car is not finished yet. The installation was fairly easy, and yes they do look nice. I did have to customize the E-Brake set up though. BTW its is an 8 inch rear. I've got 71 MachI spindles and discs on the front with a manual brake master cylinder. Hopefully they will work together.Mike
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sigtauenus
Gearhead Posts: 990
From: Lemoore, CA
Registered: Jun 2000
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posted 11-13-2000 11:02 PM
Mellow,
Like I said in the tech article, I don't have any scientific data. However, "seat of the pants" feel is definitely much improved over stock with those 2.5 inch brakes in the back, but keep in mind I have a street only car, no racing for me. For those that didn't see it, here's the link on how to do what I did on the cheap and easy... Also, for anyone seriously considering this option, please note that I did it for $200 using all NEW parts, but it can be done for significantly less than that if you re-use some of your existing parts/get good used parts.
https://mustangsandmore.com//ubb/RearBrakesbySamGriffith.html
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Billgear
Gearhead Posts: 151
From: Concord,CA
Registered: May 2000
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posted 11-14-2000 02:55 AM
How much do the bigger drums chance the offset?Regards,
Billgear www.289mustang.com
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mellowyellow
Gearhead Posts: 1358
From: So. Fl.
Registered: Aug 2000
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posted 11-14-2000 08:26 AM
Billgear! That's a good question! Comments???
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sigtauenus
Gearhead Posts: 990
From: Lemoore, CA
Registered: Jun 2000
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posted 11-14-2000 01:24 PM
quote:
Originally posted by Billgear:
How much do the bigger drums chance the offset?Regards,
Billgear www.289mustang.com
Billgear, do you mean "change the offset?" If so, and I assume you mean the offset of the backing plate, I would say the backing plate sticks back towards the fenderwell maybe 1/2 to 3/4 an inch further than stock, but that would only be a factor if you had a shortened axle housing for big'ol tires in the back. As far as wheel and tire clearance, nothing changes.
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SteveLaRiviere
Administrator Posts: 14060
From: Saco, Maine MCA # 47773
Registered: May 99
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posted 11-14-2000 02:21 PM
I swapped to 2.5" in the rear of my Mustang in 1980! {I'm a trailblazer!  }The offset is the same. You use the same axles. The width difference of the drum is accommodated by the different backing plates. ------------------
SteveLaRiviere/Webmaster -- MCA # 47773 Have rice for dinner, not transportation!
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jkilroy
Gearhead Posts: 1036
From: Austin, TX
Registered: Dec 99
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posted 11-14-2000 03:44 PM
This is easy Mellow, you HAVE the disc parts, you PAID for the disc parts, USE the disc parts.Drums provide more ultimate power because of larger surface area. They do this the FIRST stop, maybe the second but as they get hot they fade bad. Discs get rid of heat much faster and are more consistent. Go with the discs! ------------------
Jay Kilroy
68' Fastback GT 390
"No such thing as a cam thats too big"
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66351stang
Gearhead Posts: 482
From: sayville,newyork
Registered: Jul 2000
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posted 11-14-2000 05:50 PM
you would have greater stoping power with larger drum brake set up.. it is a known fact that drum brakes have a great stoping capacity than disc(on the rear)think about it..
the area of the pad for stoping verses the area of (2)brake shoe's..
most of the time rear disc are for estedic value and not for stoping power...------------------
ponycar66,have you flown in a ford latley???????
66-COUPE W/351SVO
glad i had a v-8 !!!!!!
84.5 gt350-61 falcon 302
have a great day!!!!!!!!
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cpmaverick
Moderator Posts: 829
From: Auburn, AL.
Registered: Jan 2000
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posted 11-14-2000 05:55 PM
quote:
Originally posted by 66351stang:
it is a known fact that drum brakes have a great stoping capacity than disc(on the rear)think about it..
That isn't true, stopping power isn't just a function of pad swept area, its clamping force and a lot more, I'm designing a braking system right now... If what you are saying is correct then why do 75% of new cars and trucks as well as ALL modern racing vehicles use disc brakes? Disc brakes are a far superior design, no car manufacturers would have asthetics on thier priority list, especially on such a saftey issue. That said, perhaps a wide drum set on a Mustang would outperform a certain disc brake setup. But comparing basic system to system a disc brake system is far superior. And a disc setup certainly would be less fade-resistant than a drum setup.
You don't really need discs on the street, especially on the rear. But there IS a reason for them, and they are better. [This message has been edited by cpmaverick (edited 11-14-2000).]
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jkilroy
Gearhead Posts: 1036
From: Austin, TX
Registered: Dec 99
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posted 11-18-2000 11:44 PM
Oh yeah everybody, big news, the guys at BMW and Porsche were following this thread and have decided to step back in time 50 years and change all their race cars back to 4 wheel drums! I mean, all of those road race cars are only running discs because they look cool right? I guess the automotive press was kidding when they compared the air bag with the disc brake and seat belt as one of the best safety devices ever invented? ------------------
Jay Kilroy
68' Fastback GT 390
"No such thing as a cam thats too big"
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66351stang
Gearhead Posts: 482
From: sayville,newyork
Registered: Jul 2000
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posted 11-19-2000 09:50 AM
all you proffessors,mainly manufactures are useing disc all around is because of antilock
and less maintance.in your spare time read
read,read.. you can learn alot more by reading than repaeting what other;s say.------------------
ponycar66,have you flown in a ford latley???????
66-COUPE W/351SVO
glad i had a v-8 !!!!!!
84.5 gt350-61 falcon 302
have a great day!!!!!!!!
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66351stang
Gearhead Posts: 482
From: sayville,newyork
Registered: Jul 2000
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posted 11-19-2000 06:57 PM
check out the artical in march or april mustang monthly about drum verses disc in the rear..i am not telling anyone what to use in the rear of their stang,but in my oppion the cost against the benifit of rear disc for the street does not get my vote..------------------
ponycar66,have you flown in a ford latley???????
66-COUPE W/351SVO
glad i had a v-8 !!!!!!
84.5 gt350-61 falcon 302
have a great day!!!!!!!!
IP: Logged |
SteveLaRiviere
Administrator Posts: 14060
From: Saco, Maine MCA # 47773
Registered: May 99
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posted 11-20-2000 03:26 PM
I agree that the disc brakes are superior. It's all about the shedding of heat, and disc brakes have the advantage there.But I also agree the difference in the rear isn't worth the cost or work. My Mustang was a 302 car originally, so it still has 4 wheel drums. I installed 10x2.5" drums from a Torino wagon in the rear, and a power booster from a Cougar and it stops great. {the power booster made all the difference in the world.} I may install discs in the front when my linings wear out, but I'm in no hurry. ------------------
SteveLaRiviere/Webmaster -- MCA # 47773 Have rice for dinner, not transportation!
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